Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 | /* * Copyright (c) 1999-2007 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ #include "SYS.h" #if defined(__ppc__) || defined(__ppc64__) .data .globl __current_pid .align 2 __current_pid: .long 0 MI_ENTRY_POINT(___getpid) #if defined(__DYNAMIC__) mflr r0 // note we cannot use MI_GET_ADDRESS... bcl 20,31,1f // ...because we define __current_pid 1: mflr r5 mtlr r0 addis r5, r5, ha16(__current_pid - 1b) addi r5, r5, lo16(__current_pid - 1b) #else lis r5,hi16(__current_pid) ori r5,r5,lo16(__current_pid) #endif lwz r3,0(r5) // get the cached pid cmpwi r3,0 // if positive, bgtlr++ // return it SYSCALL_NONAME(getpid, 0) lwarx r4,0,r5 // see if we can cache it cmpwi r4,0 // we can't if there are any... blt-- 1f // ...vforks in progress stwcx. r3,0,r5 // ignore cache conflicts blr 1: li r6,-4 // on 970, cancel the reservation using red zone... stwcx. r3,r6,r1 // ...to avoid an errata blr #elif defined(__i386__) .data .private_extern __current_pid __current_pid: .long 0 L__current_pid_addr = __current_pid #if defined(__DYNAMIC__) #define GET_CURRENT_PID \ call 0f ; \ 0: ; \ popl %ecx ; \ leal L__current_pid_addr-0b(%ecx), %ecx #define __current_pid (%ecx) #else #define GET_CURRENT_PID #endif /* * If __current_pid is > 0, return it, else make syscall. * If __current_pid is 0, cache result of syscall. */ TEXT LEAF(___getpid, 0) GET_CURRENT_PID movl __current_pid, %eax testl %eax, %eax jle 1f ret 1: UNIX_SYSCALL_NONAME(getpid, 0) movl %eax, %edx xorl %eax, %eax GET_CURRENT_PID lock cmpxchgl %edx, __current_pid movl %edx, %eax ret #elif defined(__x86_64__) .data .private_extern __current_pid __current_pid: .long 0 /* * If __current_pid is > 0, return it, else make syscall. * If __current_pid is 0, cache result of syscall. */ TEXT LEAF(___getpid, 0) movl __current_pid(%rip), %eax testl %eax, %eax jle 1f ret 1: UNIX_SYSCALL_NONAME(getpid, 0) movl %eax, %edx xorl %eax, %eax leaq __current_pid(%rip), %rcx lock cmpxchgl %edx, (%rcx) movl %edx, %eax ret #else #error Unsupported architecture #endif |